He had intercourse with his wife during the day in Ramadan, under the influence of drugs

Praise
be to Allah

Firstly:

We congratulate
you for your repentance and your recovery from these evil drugs, and we ask
Allah, may He be exalted, to make us, you and all the Muslims steadfast in
obeying Him, may He be exalted, until we meet Him when He is pleased with
us.

Secondly:

Whoever has
intercourse deliberately during the day in Ramadan has rendered his fast
invalid.

Ibn Qudaamah
(may Allah have mercy on him) said:

We do not know
of any difference of opinion among the scholars regarding the fact that the
one who has intercourse in the vagina, whether he ejaculates or not, or does
not penetrate the vagina but he ejaculates, has rendered his fast invalid.
This is proven by the saheeh reports.

End quote from
al-Mughni (4/372).

Whoever renders
his fast invalid in Ramadan by having intercourse must do two things:

i.                   

He must make up
that day

That is because
the Prophet (blessings and peace of Allah be upon him) instructed the one
who had intercourse during the day in Ramadan to fast one day to replace
that day, as he said to him: “And fast one day, and seek Allah’s
forgiveness.” Narrated by Abu Dawood (2393) and Ibn Maajah (1671); classed
as saheeh by al-Albaani in Irwaa’ al-Ghaleel (4/93)

An-Nawawi (may
Allah have mercy on him) said:

In addition to
offering expiation, he must also make up the day on which he had
intercourse. This is the well-known view of our madhhab, although there was
a difference of opinion concerning it, as mentioned above. Al-‘Abdari said
that it is obligatory to make up that day; this is the view of all the
fuqaha’ apart from al-Awzaa‘i…

End quote from
al-Majmoo‘ (6/344-345

ii.                 

Expiation (kafaarah)

It was narrated
from Abu Hurayrah (may Allah
be pleased with him) who said:
Whilst we were
sitting with the Prophet (peace and blessings of Allah be upon him), a man
came to him and said: O Messenger of Allah, I am doomed!

He said: “What
is the matter with you?”

He said: I had
intercourse with my wife whilst I was fasting.

The Messenger of
Allah (peace and blessings of Allah be upon him) asked: “Can you afford to
free a slave?”

He said: No.

He said: “Are
you able to fast for two consecutive months?”

He said: No.

He said: “Can
you afford to feed sixty poor persons?”

He said: No.

The Prophet
(blessings and peace of Allah be upon him) paused for a while, and whilst we
were like that, a large basket of dates was brought to the Prophet
(blessings and peace of Allah be upon him). He said: “Where is the one who
was asking?”

The man said: I
am here.

He said: “Take
it and give it in charity.”.

Narrated by al-Bukhaari
(1936) and Muslim (1111).

Shaykh al-Islam
Ibn Taymiyah (may Allah have mercy on him) said:

Intercourse in
the vagina requires expiation, and it is as if there is consensus on this
matter; there are only a few odd dissenting views.

End quote from
Sharh al-‘Umdah (4/284)

The expiation
referred to in the hadith quoted above is mentioned in order of precedence.
The one who breaks the fast by having intercourse must free a slave; if he
cannot do that, then he must fast for two consecutive months; if he cannot
do that, then he must feed sixty poor persons.

This is the view
of the majority of scholars.

Ibn al-Mundhir
(may Allah have mercy on him) said:

The scholars
differed concerning the expiation that is required of the one who has
intercourse during the day when fasting.

One group said
that he must free a slave; if he cannot afford to do that, he must fast for
two consecutive months; if he is not able to do that, he must feed sixty
poor persons. This is the view of Sufyaan ath-Thawri, al-Awzaa‘i, ash-Shaafa‘i,
Ahmad, Abu Thawr, an-Nu‘maan and his two companions.

End quote from
al-Ishraaf (3/121).

Secondly:

If someone
consumes or drinks something in Ramadan that causes him to become
intoxicated, then he has intercourse with his wife, he cannot be excused
from having to offer expiation on the grounds that he was under the
influence of the intoxicant, rather the reason for the expiation is still
applicable in his case, which is that he transgressed the sanctity of the
month by having intercourse, to which is added the fact that he consumed
something unlawful, so his sin is greater. >> That is because he knew, when
he was sober, that he should keep away from intoxicants, but he did not do
that, so he is to be punished for what he did.

See: Majmoo‘
al-Fataawa (33/103, 108); and I‘laam al-Muwaqqi‘een (5/196).

Thirdly:

If fasting was
obligatory for the wife on those days, and she willingly went along with him
with regard to having intercourse, even though she knew that it was not
permissible for her to do that, she must also make up those days and offer
expiation for them.

But if she was
forced, or fasting was not obligatory for her on those days, or she was
unaware of the ruling, in the sense that she thought that it was obligatory
for her to obey her husband in that, then in this case she does not have to
offer expiation.

This has been
discussed previously in question no. 106532.

Conclusion: You
have to offer expiation for these days on which you had intercourse. If you
are not able to free a slave, and you have a valid reason for which you are
not able to offer the expiatory fast, then you must feed sixty poor persons
for each day that you had intercourse, and you must make up each day.

The amount of
food to be given when feeding the poor has been explained in question no.
106535.

And Allah knows
best.